After they suffered an attack last year,in which around 6.5 million password were stolen by hackers,LinkedIn announced on Friday about now providing the two-factor authentication.This two way authentication will ask a user to provide a numeric code,which will be sent to them via SMS as soon as they log-in in their account from an unknown device for the first time.With this option,LinkedIn stated that it will be more difficult for attackers to get access into an account.Source: [Click Here!]